It must improve the regularity of the present cupreous alloys in order to reduce the rate of contact loss and make its quality reaches up to the level of excellent overseas congeneric product.
另外，对现有的银铜类合金接触线应改善它的平直度，以降低离线率，使质量达到国外同类先进产品的水平。
The fractionation of LREE is very intense and with the evident negntive anomaly of Eu. The Muchang A-type granite is a congeneric product with the Upper Permian volcanic sequences formed by the mix…
木厂A型花岗岩与上二叠统火山岩系具同源性，乃玄武岩浆与陆壳局部重熔岩浆的混合物。
The fractionation of LREE is very intense and with the evident negntive anomaly of Eu. The Muchang A-type granite is a congeneric product with the Upper Permian volcanic sequences formed by the mix…
木厂A型花岗岩与上二叠统火山岩系具同源性，乃玄武岩浆与陆壳局部重熔岩浆的混合物。
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